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| author | Ulf Hansson <ulf.hansson@linaro.org> | 2018-04-05 13:42:00 +0200 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-05-08 09:33:42 +0200 |
| commit | 1433269c4d2461be1f36db5dbb453976b38996ff (patch) | |
| tree | e9f58931e1bdc1fd357e8ce7061003264ff4b666 /include/linux/mmc | |
| parent | 3a3db6030b64ceb4b4e41a6811168c5d90a9f7f8 (diff) | |
| download | lwn-1433269c4d2461be1f36db5dbb453976b38996ff.tar.gz lwn-1433269c4d2461be1f36db5dbb453976b38996ff.zip | |
mmc: core: Export a function mmc_sw_reset() to allow soft reset of cards
It's rather common that a firmware is loaded into an SDIO func device
memory, by the corresponding SDIO func driver during ->probe() time.
However, to actually start running the new firmware, sometimes a soft reset
(no power cycle) and a re-initialization of the card is needed. This is for
example the case with the Espressif ESP8089 WiFi chips, when connected to
an SDIO interface.
To cope with this scenario, let's add a new exported function,
mmc_sw_reset(), which may be called when a soft reset and re-initialization
of the card are needed.
The mmc_sw_reset() is implemented on top of a new bus ops callback, similar
to how the mmc_hw_reset() has been implemented.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Quentin Schulz <quentin.schulz@bootlin.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Diffstat (limited to 'include/linux/mmc')
| -rw-r--r-- | include/linux/mmc/core.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h index 927519385482..134a6483347a 100644 --- a/include/linux/mmc/core.h +++ b/include/linux/mmc/core.h @@ -177,6 +177,7 @@ int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries); int mmc_hw_reset(struct mmc_host *host); +int mmc_sw_reset(struct mmc_host *host); void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card); #endif /* LINUX_MMC_CORE_H */ |